JPH08323895A - Manufacture of connected bag body - Google Patents

Abstract

PURPOSE: To obtain a connected bag body, whose openings can be opened without employing any special device, by a method wherein welding precluding treatment is applied on one side of a substrate film of thermosetting resin and a plurality of bags are produced while positioning the treated surface at the inside of the bags while the openings are superposed in the same direction and the part, which has received welding precluding treatment, is stung by a hot rod-type body. CONSTITUTION: The precluding treatment of welding in case of being heated is applied on one side of a substrate film 3. Next, a bag 2 is produced employing the substrate film 3 having a precluding part 4 on the one side thereof. The bag 2 is manufactured by a method wherein a plurality of precluding parts 4 are provided in parallel to the lengthwise direction of the substrate film 3, for example, and the substrate film 3 is cut into a plurality of film bands 5 in accordance with necessity to make bags. A plurality of such bags are prepared to pile the bags 2, whose inner surfaces are applied with mold releasing treatment, so that the precluding part 4 are superposed on a straight line, then, the superposed part of the precluding parts 4 is penetrated by a hot rod type body 7 to effect block seal by providing holes 6. The inner surfaces of the bags 2, to be applied with welding precluding treatment, are not welded while only spaces between neighboring bags are welded whereby a connected bag body 1 is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection bag body in which a plurality of bags are connected in series, and more specifically, a connection bag body in which the outer surface of the bag is attached to the outer surface of an adjacent bag while the inner surface of the bag is not attached. Regarding the method.

[0002]

2. Description of the Related Art When a flexible bag is used for automatic packaging, it is very difficult to open a filling port for contents in an automatic packaging line. In order to solve such a problem, conventionally, a method of blowing air from the filling port of the bag toward the inside of the bag to open it, and a method of pulling and opening the outer surface of the bag around the filling port with a suction cup or the like have been adopted. It was

However, in the method, opening is difficult when a bag having blocking property is used, and when the method is used, opening is difficult when a bag having a weak waist is used. In addition, in both cases, it was necessary to attach a special device to the automatic packaging line.

In order to solve such a problem, we have proposed in Japanese Patent Application No. 7-110520 that the outer surface of a bag is attached to the outer surface of an adjacent bag to form a connected bag body having a plurality of bags in series. And its manufacturing method were proposed. Since the connecting bag body proposed here is attached to the adjacent bag, when the bag filled with the content is pulled, the adjacent bag is pulled out together. At this time, since only the outer surface of the bag is attached to the adjacent bag and the inner surface of the bag is not attached, the bag for filling the contents next is pulled out with the filling port opened, This saves the trouble of opening the filling port of the bag.

However, the manufacturing method proposed by us in Japanese Patent Application No. 7-110520 for manufacturing such a connected bag body requires two kinds of bags which are symmetrical to each other, and these bags are produced. , Management was complicated.

[0006]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a connecting bag body of a single type, which can stably perform the opening of the filling port of the bag without using a special device. It is to provide a method that can be easily manufactured using a bag. It is an object of the present invention to provide a method for manufacturing a connecting bag body which can be manufactured by using a general printing machine, a laminating machine or the like without requiring a special device.

[0007]

Means for Solving the Problems In the present invention, as a means for solving the above-mentioned problems, a fusion prevention for preventing the base film from being heat-sealed on one surface of the base film made of a thermoplastic resin. A bag is produced by subjecting the base material film to bag treatment so that the fusion-inhibiting treatment portion is on the inner side, and a plurality of the same bags are produced in the same manner. A method of manufacturing a connecting bag body in which a portion having a fusion prevention treatment portion is pierced with a heat rod-shaped body so that the outer surfaces of the bags are block-sealed is further provided, and the fusion prevention treatment is a mold release. Provided is a method for producing the connecting bag body, which is applying an agent, and further, the fusion prevention treatment is provided a method for producing the connecting bag body, which is coating a heat resistant resin, Furthermore,
Provided is a method for producing the connecting bag body, wherein the fusion prevention treatment is laminating a release tape or a release film, and further, the fusion prevention treatment is a length of a base film. There is provided the method for manufacturing the connecting bag body, which is characterized in that the connecting bag body is applied in parallel with the direction.

That is, when bags whose fusion prevention treatment is applied to the inner surface are stacked and block-sealed with a heating rod-like body, only the outer surface not subjected to the mold release treatment is heat-sealed to obtain a connected bag body. The inventors have found out that, and have reached the present invention.

A connecting bag often used in the present specification means that the inner surface of the bag is not attached except for the seal portion forming the bag, and the outer surface of the bag is attached to the adjacent bag, so that a plurality of bags are formed. It means a bag body in which bags are connected in series.
Further, the connection bag body according to the present invention is preferably used as a packaging material in the case of mechanically performing automatic packaging, but is not limited to this, a bag for containing cleaned clothes, a garbage bag, a shopping bag, It can be used in any case when packaging an article which has been conventionally packaged in a flexible bag such as an umbrella bag, and is particularly suitable for packaging in which opening of the filling port is difficult.

Next, the manufacturing method of the connecting bag of the present invention will be described in more detail with reference to the drawings. FIG. 1 is an explanatory view showing an example of a method for manufacturing the connection bag body 1 according to the present invention. First, one side of the base film 3 is subjected to a fusion preventing treatment for preventing the base film from being fused when the base film is heated (FIG. 1- (A)).

The material of the substrate film 3 is not limited, and high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polybutene-1. , Ethylene-vinyl acetate copolymer, soft polyvinyl chloride, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, thermoplastic polyurethane, ionomer, etc., or a blend of a plurality of synthetic resins It may be a single-layered film, or a laminated sheet in which one or a plurality of these synthetic resins constitutes each layer.
As a method for obtaining a synthetic resin film from these resins, known methods such as an inflation method and a T-die method can be used. To obtain a laminated film, known laminating methods such as coextrusion laminating method, dry laminating method and extrusion laminating method can be used.

Although the method of the fusion prevention treatment applied to the base material film 3 is not limited, in the present specification, as a treatment method which can be performed relatively easily and inexpensively, a method of applying a release agent and a heat resistant resin are used. The method of coating and the method of laminating a release tape or film are illustrated.

Examples of the release agent used in the method (1) include silicone type release agents and fluorine type release agents, but solvent type silicone release agents have a low solution viscosity and thus are printed. It is particularly preferable because it can be easily applied to the base material film 3 by a machine, does not require a special device for curing the applied solvent, and has little influence on the base material film 3 when the solvent is cured. .

The heat-resistant resin used in the above method has a temperature at which the resin melts and begins to adhere to the base film at 30 ° C. higher than the temperature at which the base film starts to melt and adhere to the base film. If the resin is higher than the above, it can be used without particular limitation. When the base material film 3 is a polyethylene-based resin, a nylon resin is preferably used as the heat-resistant resin in terms of functionality and economy.

Further, as the release tape or film used in the method (1), it is preferable to use a general-purpose release tape or film having a back surface coated with an adhesive and a front surface subjected to a release treatment. .

The method of applying the fusion prevention treatment is not particularly limited, but when the fusion prevention treatment method is the release agent coating, it can be easily applied by using a printing machine. Further, when the fusion preventing treatment is a heat resistant resin, a method of coating a part or the entire surface of the base film 3 with the heat resistant resin by using an extruder will be exemplified. When a release tape or film is laminated, it may be attached directly to the base film 3 or via an adhesive. Among these fusion-preventing treatments, as a method with a reliable fusion-preventing effect, there may be mentioned a method of laminating a release tape or a film, but the treatment method is complicated and costly, Except in special cases, the method of applying a solvent-type release agent is preferable because it is simple and inexpensive. In particular, the method of applying a silicone-based release agent can be used for food packaging because it is hygienic,
Further, since the release material is transparent, the appearance of the bag is not deteriorated.

There is no particular limitation on the portion to be subjected to the fusion prevention treatment (hereinafter referred to as a prevention portion), and it may be performed on the entire surface of the base film or only on a necessary portion (see FIG. 2). ). However, when the film is heat-sealed to form a bag, the blocking portion 4 works in a direction to reduce the sealing strength, and therefore, the blocking portion 4 preferably has a small area. Further, when the blocking portion 4 is mechanically provided by using the method described above, it is preferable to provide the blocking portion 4 in parallel with the length direction of the film in consideration of work efficiency. Further, the blocking portion 4 is used when a heat resistant resin is coated by using an extruder,
When the release tape or film is adhered, it is preferable to continuously provide the blocking portion 4 as shown in FIG. 2 (B) in order to avoid complicated work, but when using a printing machine, for example, As shown in FIG. 2C, only necessary portions may be discontinuously provided.

Next, the bag 2 is prepared using the base film 3 having the blocking portion 4 on one surface. Although the bag-making method is not particularly limited, for example, a plurality of blocking portions 4 are provided in parallel to the length direction of the base film 3 (FIG. 1- (A)), and the base film is formed into a plurality of film bands as necessary. Cut into 5 (Fig. 1-
(B)), and bag making (FIG. 1- (C)). Even when the fusion preventing treatment is a method of coating a heat resistant resin, the bag 2 can be similarly prepared,
In this case, the portion of the bag 2 that contacts the blocking portion 4,
Both sides must be fusion-blocked. When applying a release agent or laminating a release tape or film, it is possible to prevent the molten base film 3 from adhering by simply applying it to one of the inner surfaces of the film, but when coating with a heat resistant resin This is because the blocking effect cannot be obtained unless both films are treated for adhesion.

Finally, a plurality of bags 2 thus obtained are prepared to manufacture the connecting bag band 1. The bags 2 whose inner surfaces have been subjected to a mold release process are stacked so that the blocking portions 4 are aligned in a straight line, and the heating rod-shaped body 7 penetrates the overlapping portions of the blocking portions 4 (FIG. 1- (F)) to form the holes 6. Install and block seal. Without fusing the inner surface of the bag 2 which has been subjected to the fusion prevention treatment,
Only the adjacent bags are heat-sealed to obtain the connected bag body 1. The number of block seals to be penetrated by the heat rod-shaped body 7, that is, the number of block seals, is not specified. However, the larger the number, the higher the sealing point between the bags and the higher the adhesive strength, but it takes time and effort to manufacture the bags and separate the used bags. . In addition, the heating rod 7
Any material can be used without particular limitation as long as it can block-seal the stacked bags.

When the bag 2 is removed from the connecting bag 1 after the contents are filled, the hole 6 is formed so that the removed bag 2 has a hole 6 and the appearance of the bag 2 is not deteriorated. Alternatively, perforations may be provided on the bottom side, and after filling the contents, the side having the holes 6 may be cut off at the perforations.

[0021]

EXAMPLE A method for manufacturing a connecting bag according to the present invention will be described with reference to an example. A high-density polyethylene resin with a diameter of 125 mm and an annular die attached to its tip.
After manufacturing a tubular film having a thickness of 18 μm and a folding diameter of 800 mm by an inflation extrusion molding method using an mmφ extruder, the film is cut in the longitudinal direction to obtain a sheet-shaped base film having a width of 700 mm. .

Next, a silicone type release agent (Toray Dow Corning Silicone Co., Ltd .: SD7223) 1
0.9 parts by weight of a catalyst (Toray Dow Corning Silicone Co., Ltd .: SRX-212) was added to 00 parts by weight,
This was diluted with a solvent in which n-hexane and toluene were mixed at a weight ratio of 1: 4. At this time, the release agent to which the catalyst was added and the diluent solvent were mixed at a weight ratio of 1.2: 100. This is applied to one end of the base film using a printing machine so as to be parallel to the lengthwise direction to provide a fusion preventing part.

Further, the base film is half-folded so that the fusion-inhibiting portion is on the inner surface, and this is melt-sealed every 25 cm in a direction perpendicular to the width direction of the film to form a plurality of 25 cm × 35 cm bags. Then, these bags were overlapped with their openings aligned, and the portion where the adhesion-preventing portion was present was pierced with a hot rod.

A connected bag body was obtained in which the outer surfaces of the bags were heat-sealed to each other. Further, the release agent can be applied by an ordinary printing machine without providing a special device, and it can be dried extremely quickly at room temperature to function as a fusion preventing part.

[0025]

[Effect] When the connecting bag 1 according to the present invention is used, the inner surface of the bag is not attached and only the outer surface is connected to form a series, so that a used bag can be taken out and a new bag can be loaded at the same time. The filling port can be taken out in an open form. Therefore, when the connecting bag body of the present invention is used for automatic packaging, a special device for opening the bag is unnecessary, and the bag can be opened stably regardless of the material of the bag. Further, when the connecting bag body 1 of the present invention is attached to a trash box or the like and is used from the bag located at the end, it is possible to save the labor of attaching the trash bag to the trash box. In addition, when the connecting bag body 1 of the present invention is used for packaging a flexible bag with contents, such as packaging of cleaned clothes, work for opening the opening of the bag or taking out a new bag. Work is saved and work efficiency is improved.

Further, when the method for manufacturing the connecting bag 1 according to the present invention is used, it is not necessary to use a bag having a special shape. Further, as the fusion preventing treatment, when the method of applying the release agent of the present invention is used, it is possible to mechanically treat only a desired portion by using an ordinary printing machine, and the connecting bag body is inexpensive and easy. 1 is obtained. Further, when the method of coating the heat resistant resin of the present invention is used, it can be mechanically manufactured using an extrusion laminating machine. Furthermore, if a method of laminating a release tape or film is used, adhesion of the inner surface can be prevented more reliably.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a method for manufacturing a connecting bag according to the present invention. Note that (E) is a cross-sectional view taken along the line aa ′ of (D).

FIG. 2 is a plan view illustrating a position where a blocking portion is provided on a base film.

[Explanation of symbols]

 1 Connection Bag 2 Bag 3 Base Film 4 Blocking Area 5 Film Band 6 Hole 7 Heat Rod

Claims (5)

[Claims] 1. A base material film made of a thermoplastic resin is subjected to a fusion preventing treatment for preventing heat fusion of the base material film, and the base material is placed so that the fusion preventing treatment portion is on the inner side. The film is made into bags to make bags, and the same bags are made in the same way, and these bags are overlapped so that the openings are in the same direction. A method of manufacturing a connected bag body, which comprises piercing with a body and block-sealing the outer surfaces of the bags. 2. The method of manufacturing a connecting bag according to claim 1, wherein the fusion preventing treatment is applying a release agent. 3. The method for producing a connecting bag according to claim 1, wherein the fusion preventing treatment is coating with a heat resistant resin. 4. The method for producing a connecting bag according to claim 1, wherein the fusion preventing treatment is to laminate a release tape or a release film. 5. The method for producing a connecting bag according to claim 1, wherein the fusion preventing treatment is performed in parallel with the length direction of the base film.